Electrical nerve stimulation instrument



FIG. 1 is an isometric view of an electrical nerve stimulation instrument showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a rear elevation view thereof. 

The ornamental design for an electrical nerve stimulation instrument, substantially as shown. 